Speaker install - torque

[cjenrick]

here is a blub from Weber and Scumback, no power tools, X pattern torque, amount of torque can influence tone:





change in the weather>

"The (main) reason the screws/bolts loosen up on drivers -- particularly on woofers and larger mid-range drivers, where the screws go deep into the baffle (or all the way through it, in the case of bolts-into-T-nuts,) is because the wood expands and contracts with changes in humidity through the seasons. And particle board seems to be most prone to this kind of expansion/contraction.

If your speakers are fastened to a particle board baffle with wood screws, you'd be wise to replace them with bolts-and-T-nuts, because you can only re-tighten screws in particle board a few times before you strip out the holes ;~)"

[Mick Bailey]

FWIW at the Marshall factory they use an air driver.

[J M Fahey]

There is a local speaker pro (he worked at Clare Brothers) & for high power rigs he tightens the speaker with a tone running through them.

**Excellent** idea. Not only gives advanced warning of frame twisting but cone touching something, panel vibration and anything else.
Better find it out NOW, on tge assembly table, than later on a working installation, 5 minuutes from show starting.

[catalin gramada]

There is a local speaker pro (he worked at Clare Brothers) & for high power rigs he tightens the speaker with a tone running through them.

Is a impedance matching. Phisical impedance matching. As same as transfer energy from a string to the body top through the bridge. The pressure matter, the material matter. Just manage how filter the vibrations. Cannot achieve a dead damped baffle even if it made from concrete. It need to manage the transfer from speaker basket to baffle. The phisical coupling matter and can be managed:1 using different gasket material (as rubber , foam, cork, felt, but saw also bronze), 2. different nut couplings. 3. adjusting the pressure of speaker basket to baffle. And further, in case of musical instruments, the coupling baffle to the cabinet. It is a confusion here: The bolts should be tighten mainly to not achieve permanent deformation to the gasket not to the basket Using a smaller screwdriver gives better posibility to control the tension by hand
Did you ever touch a unpluged electric guitar to a door , a table etc ? The furniture start to sing and the amplitude and freq reponse depends how much pressure apply-meant coupling. You get so much amplitude can even practice with it. This is happen also to a speaker coupled with a baffle when starts to excite. There is not acoustic transfer but filtered micro vibes. Think vibes - micro, then torque the bolts